Pregnancy Chances After Unprotected Intercourse: A Guide - Obstetrics and Gynecology

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Understanding the chances of pregnancy after unprotected intercourse is a common concern for many couples. In your case, your girlfriend's menstrual cycle and the timing of your sexual activity are crucial factors to consider.

Firstly, let's look at the menstrual cycle. A typical menstrual cycle lasts about 28 days, but it can vary significantly from person to person, ranging from 21 to 35 days. Ovulation typically occurs around 14 days before the start of the next menstrual period. If your girlfriend's last menstrual period started on May 29, and assuming she has a regular cycle, she would likely ovulate around June 12. Since you had unprotected intercourse on June 26 and June 29, this timing is outside her fertile window, which generally lasts from about five days before ovulation to one day after. Therefore, the chances of pregnancy from intercourse on those dates are relatively low.

However, it's important to note that sperm can live inside the female reproductive tract for up to five days. If your girlfriend had ovulated later than expected, there is still a slight chance of pregnancy. The fact that she has not yet received her period could be due to several factors, including stress, hormonal fluctuations, or other health issues, rather than pregnancy alone.

Regarding the negative pregnancy test result on July 3, it is possible that it was taken too early. Home pregnancy tests are most accurate when taken after a missed period. If her period does not arrive soon, it would be advisable for her to take another test a week after the first one or consult a healthcare provider for a blood test, which can detect pregnancy earlier and more accurately.

The symptoms your girlfriend is experiencing, such as breast tenderness, can occur both in early pregnancy and as part of the premenstrual syndrome (PMS). This symptom alone is not a definitive indicator of pregnancy.

In summary, while there is a possibility of pregnancy, the timing of your intercourse suggests that the likelihood is low. If your girlfriend's period does not arrive soon, it would be prudent for her to retest or seek medical advice. Stress and anxiety about the situation can also affect menstrual cycles, so it's essential to approach this with a calm mindset.
If you have further questions or concerns, don't hesitate to reach out to a healthcare professional who can provide personalized advice based on your girlfriend's health history and current situation.